The thorn leafroller is the commonest species in this genus. The abdomen is black without a band of reddish-yellow on the middle segments. The third antennal segment is clearly shorter than the scape and about the same length as, or less than, segment four. Scutellum yellow. Antennal scape dark marked at the base of the inner side. Head usually with conspicuous yellow spots behind each eye.
Larvae on hawthorn, blackthorn etc., and rowans. They create a leaf-roll from within which they feed.
Size: 8 - 10mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to July
Plant associations: Crataegus spp, Prunus spp., and Sorbus spp. (hawthorns, wild plums and rowans)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168